This church was constructed on the site where St. Philip the Apostle preached to the ancient Athenians.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A martyred saint built a nunnery and school for girls here known as the "Parthenon."

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

Where commuters walk through remnants of an ancient Greek necropolis.

A sprawling collection of books and manuscripts about ancient Greece that would have put their famed libraries to shame.

Collection of fossils, plants, and ancient animals encased in amber.

Built in 1512, the oldest cathedral in the Americas.

This staircase in a lush tropical grotto was built by enslaved laborers and renamed to honor Queen Victoria's role in ending slavery in the British Empire.

One of the tallest bell towers in Italy plays a particular melody at just two times each day.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

The prototype for all Nazi concentration camps.

The caldera of this mini-volcano has been turned into a naturally heated mud bath.

Perched atop the highest hill in Cartagena, this 17th-century convent offers spectacular views of the city.

On Hilton Head Island this bronze King of the Sea rules all things briny—and lets you know if you’re late for lunch.

This twisty sign depicts the chain's first logo.

A unique museum dedicated to the Gullah-Geechee people, housed within an old oyster cannery.

The remnants of the fortress that saved Georgia from the Spanish still stand guard on their swampy island.

Carved faces add a touch of magic to this island's impressive oak trees.

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.